<template>
  <div>
    <!-- Breadcrumb 面包屑 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/rights' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>用户管理</el-breadcrumb-item>
      <el-breadcrumb-item>用户列表</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
      <!-- 添加按钮 -->
      <el-button type="primary">添加角色</el-button>

      <!-- 表格添加数据区域 -->
      <el-table :data="rolesList" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <!-- 渲染一级权限 -->
            <el-row
              :class="['bdbottom', i1 === 0 ? 'bdtop' : '', 'vcenter']"
              v-for="(item1, i1) in scope.row.children"
              :key="item1.id"
            >
              <el-col :span="5">
                <el-tag
                  closable
                  @close="removeRightById(scope.row, item1.id)"
                  >{{ item1.authName }}</el-tag
                >
                <i class="el-icon-caret-right"></i>
              </el-col>
              <el-col :span="19">
                <!-- 渲染二级三级权限 -->
                <el-row
                  :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']"
                  v-for="(item2, i2) in item1.children"
                  :key="item2.id"
                >
                  <el-col :span="6">
                    <el-tag
                      @close="removeRightById(scope.row, item2.id)"
                      closable
                      type="success"
                      >{{ item2.authName }}</el-tag
                    >
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                    <el-tag
                      @close="removeRightById(scope.row, item3.id)"
                      closable
                      type="warning"
                      v-for="item3 in item2.children"
                      :key="item3.id"
                    >
                      {{ item3.authName }}
                    </el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index"></el-table-column>
        <el-table-column prop="roleName" label="角色名称"> </el-table-column>
        <el-table-column prop="roleDesc" label="角色秒速"> </el-table-column>
        <el-table-column label="操作">
          <!-- 添加插槽 -->
          <template slot-scope="scope">
            <el-button type="primary" icon="el-icon-edit" size="mini"
              >编辑</el-button
            >
            <el-button type="danger" icon="el-icon-delete" size="mini"
              >删除</el-button
            >
            <el-button
              type="warning"
              icon="el-icon-star-off"
              size="mini"
              @click="showSetRightDialog(scope.row)"
              >分配权限</el-button
            >
          </template>
        </el-table-column>
      </el-table>
    </el-card>
   
    <!-- 分配权限的对话框 -->
    <el-dialog title="分配权限" :visible.sync="setRightDialogVisible" width="50%" @close="setRightDialogClosed">
      <!-- 树形控件 -->
      <el-tree :data="rightsList" :props="treeProps" show-checkbox node-key="id" default-expand-all :default-checked-keys="defKeys" ref="treeRef"></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
        //所有角色列表数据
      rolesList: [],
       // 控制分配权限对话框的显示与隐藏
      setRightDialogVisible: false,
      //所有权限的数据
      rightsList:[],
      //树形控件的属性绑定对象
      treeProps:{
          label:'authName',
          children:'children'
      },
      //默认选中的节点Id值数组
      defKeys:[],
       //当前即将分配权限的角色id
      roleId:'',
    };
  },
  created() {
    // 自动调用getRolesList方法
    this.getRolesList();
  },
  methods: {
    async getRolesList() {
      const { data: res } = await this.$http.get("roles");
      if (res.meta.status !== 200) {
        return this.$message.error("获取列表失败！");
      }
      console.log(this.rolesList);
      this.rolesList = res.data;
    },
    //根据id删除管理权限
    async removeRightById(role, rightId) {
      //弹框提示用户是否要删除
      const confimResult = await this.$confirm(
        "此操作永久删除，是否继续",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning"
        }
        //捕获用户的取消行为，为结果return出去
      ).catch(err => err);

      if (confimResult !== "confirm") {
        return this.$message.info("取消了删除");
      }

      const { data: res } = await this.$http.delete(
        //接口中请求路径：
        `roles/${role.id}/rights/${rightId}`
      );

      if (res.meta.status !== 200) {
        return this.$message.error("删除权限失败");
      }

      //this.getRolesList() //不需要调用此方法
      //无需在重新加载所有权利
      //只需要对现有的角色进行权限更新
      role.children = res.data;
    },

    async showSetRightDialog(role) {
      this.roleId = role.id;
      //获取所有权限的数据
      const { data: res } = await this.$http.get("rights/tree");

      if (res.meta.status !== 200) {
        return this.$message.error("获取权限失败");
      }

      //把获取到的权限数据保存到data中
      this.rightsList = res.data;
      console.log(this.rightsList);

      //递归获取三级劫点的Id this.defKeys
      this.getLeafKeys(role, this.defKeys);

      //显示对话框
      this.setRightDialogVisible = true;
    },

    //通过递归的形式，获取角色下所有三级权限的id，并保存到defkeys 数组中
    getLeafKeys(node, arr) {
      //如果当前node劫点不包含children属性，
      if (!node.children) {
        return arr.push(node.id)
        console.log(node.id)
      }
        //每次循环一次获取到一个子劫点（item）然后在根据item再次调用递归函数
        node.children.forEach(item => this.getLeafKeys(item,arr))
     },
      
    //每循环分配权限对话框的关闭事件（否则数组的数据不会清空会导致数组中越来越多）
     
  setRightDialogClosed(){
    this.defKeys=[]
    },
    //点击为角色分配权限
    async allotRights(){
        const keys =[
            ...this.$refs.treeRef.getCheckedKeys(), //若节点可被选择（即 show-checkbox 为 true），则返回目前被选中的节点的 key 所组成的数组
        ...this.$refs.treeRef.getHalfCheckedKeys() //若节点可被选择（即 show-checkbox 为 true），则返回目前半选中的节点的 key 所组成的数组
        ]

        console.log(keys)

        const idStr = keys.join(',')

        const{data:res} =await this.$http.post(
            `roles/${this.roleId}/rights`,
            {rids:idStr}
        )

        if(res.meta.status !==200){
            return this.$message.error('分配权限失败！')
        }

        this.$message.success('分配权限成功')
        this.getRolesList()
        this.setRightDialogVisble=false
    }
    
  }
};
</script>

<style lang="less" scoped>
.el-tag {
  margin: 7px;
}

.bdtop {
  border-top: 1px solid #eee;
}

.bdbottom {
  border-bottom: 1px solid #eee;
}

// 纵向居中对齐
.vcenter {
  display: flex;
  align-items: center;
}
</style>
